申请人:AGFA-GEVAERT N.V.
公开号:US04013473A1
公开(公告)日:1977-03-22
Thermographic recording material or image-receiving material for dry copying processes comprising at least one layer and a substantially non-photosensitive reducible silver salt, a reducing agent, and optionally a toning agent or toning mixture, wherein the reducing agent corresponds to the following general formula: ##STR1## wherein: EACH OF R.sup.1, R.sup.3 and R.sup.5 (equal or different) represents hydrogen, a straight-chain or branched alkyl group comprising 1 to 9 carbon atoms, or a cycloalkyl group, with the proviso that R.sup.1 and R.sup.5 do not represent hydrogen simultaneously, R.sup.2 represents a straight-chain or branched alkyl group comprising 1 to 4 carbon atoms, or a cycloalkyl group, R.sup.4 represents hydrogen, or a straight-chain or branched alkyl group comprising 1 to 4 carbon atoms, or a cycloalkyl group, And wherein each of R.sup.1 and R.sup.2 together, R.sup.2 and R.sup.3 together or R.sup.4 and R.sup.5 together optionally represent a straight-chain or branched alkylene group for completing a 6-membered ring; provided that that R.sup.1, R.sup.5 or R.sup.3 does not represent t-butyl if the respective adjacent substituent(s) represent(s) a straight-chain or branched alkyl group.
干法复印过程的热成像记录材料或图像接收材料,包括至少一层和一个基本上非光敏的可还原银盐、还原剂和可选的定色剂或定色混合物,其中还原剂对应于以下通式:##STR1## 其中:R.sup.1、R.sup.3和R.sup.5(相同或不同)中的每一个表示氢、包含1到9个碳原子的直链或支链烷基或环烷基,但R.sup.1和R.sup.5不能同时表示氢,R.sup.2表示包含1到4个碳原子的直链或支链烷基或环烷基,R.sup.4表示氢或包含1到4个碳原子的直链或支链烷基或环烷基,其中R.sup.1和R.sup.2一起、R.sup.2和R.sup.3一起或R.sup.4和R.sup.5一起可选地表示直链或支链亚烷基以完成一个6元环。但如果相应的相邻取代基表示直链或支链烷基,则R.sup.1、R.sup.5或R.sup.3不表示叔丁基。